.App{
  width: 100%;
  height: 100%;
  background:url(./assets/pageBg.png) center center no-repeat;
  .top{
    width: 100%;
    height: 60px;
  }
  .con{
    width: 100%;
    height: calc(100% - 60px);
    display: flex;
    justify-content: space-around;
    .left{
      width: 25%;
    }
    .conter{
      flex:1;
    }
    .right{
      width: 25%;
    }
  }
}